S71200 & ET 200 SP With distributed IOs problem when uplugging ethernet Cable

Hello, 

I am working on project with S7 1200 DC/DC/Rly an ET 200SP with distributed IOs and analog outputs and inputs. During testing when I unplug the Ethernet Cable of the CPU The distributed Digital and analog output reset to zero. When I plug it back in the outputs return to their previous situation (where was before  I unplug the cable). That might be dangerous if the outputs are connected to a motor or a valve in real word. Any what could I do to protect this situation in my LADER Code for reset the outputs or reset the CPU.  I am new to S7 1200 and I can not find a solution.

Thanks In Advance,

Hi Parkour,

There is a parameter called "Reaction to CPU STOP" in the hw config of the card

Maybe you can test if the card also uses this when the ethernet cable is unplugged?

Hello and thank you for your answer.

The Reaction to CPU stop parameter is set to shutdown and this is work as expceted my problem is than when I plug back the ethernet caple the outpus are coming to their previous state. I need to  automaticaly reset the outputs when the cable is pluged back.

Thanks,

Sorry i completely misunderstood the problem,

Can you test if OB83 'Pull or plug of modules' interrupt is called when you unplug the cable?

Maybe you can but the ladder code for resetting the values in here, then it should be zero when it is plugged back in

I can not find that OBB3 interrupt that you told can you please help where is this block in Instruction group. 

Thank you,

Hello and thank you for your answer, 

Can you tell the steps to enable PN monitoring in TIA Portal I try to find it but I couldn't.

Thanks In Advance,